went live - links not working anymore - please help

[eluser]heymike[/eluser]
not sure if it helps, but if i try browsing to

http://www.eglisedieuvivant.org/applicat...elcome.php

i get the following error

Fatal error: Class welcome: Cannot inherit from undefined class controller in /var/www/canada/eglisedieuvivant.org/application/controllers/welcome.php on line 3